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Use CaptureDroppedDiagnostics to make sure that there is a diagnostic
client installed when warning flags are parsed.

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migration. Also, fixes an old bug where older migration 
flags were not being checked for properly.


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Include a test that clang now produces output files with permissions matching
the umask.

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The operator== calls equivalent which calls default_error_condition which
handles windows to posix conversion.

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* Use a single stat to find out if the file exists and if it is a regular file.
* Use early returns when possible.
* Add comments explaining why we have each check.

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usage of clang as a library.


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The top-level hash is used to determine if we need to update the global code-completion results.
ImportDecls did not affect the hash so a newly introduced ImportDecl would not trigger an update of the global results.

rdar://14202797

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follow.


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given -disable-free. (Reviewed by John McCall over IRC.)


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This prevents -pedantic from causing warnings in the system headers
used to create modules. Fixes <rdar://problem/14201171>.


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headers may be included from within the module, but not from outside
the module.



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These options will add a module flag with name "Dwarf Version".
The behavior flag is currently set to Warning, so when two values disagree,
a warning will be emitted.


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The big changes are:
- Deleting Driver/(Arg|Opt)*
- Rewriting includes to llvm/Option/ and re-sorting
- 'using namespace llvm::opt' in clang::driver
- Fixing the autoconf build by adding option everywhere

As discussed in the review, this change includes using directives in
header files.  I'll make follow up changes to remove those in favor of
name specifiers.

Reviewers: espindola

Differential Revision: http://llvm-reviews.chandlerc.com/D975

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This is preparation for replacing Path.h with PathV2.h.

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Actions outlive consumers. PR16295. Found by AddressSanitizer.

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A while ago we allowed libclang to build a PCH that had compiler errors; this was to retain the performance
afforded by a PCH even if the user's code is in an intermediate state.

Extend this for the precompiled preamble as well.

rdar://14109828

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